Ssh (Secure Shell) a program for logging into a remote machine and forexecuting commands in a remote machine. It is intended to replacerlogin and rsh, and provide secure encrypted communications betweentwo untrusted hosts over an insecure network. X11 connections andarbitrary TCP/IP ports can also be forwarded over the secure channel.

OpenSSH is OpenBSD's rework of the last free version of SSH, bringing itup to date in terms of security and features, as well as removing allpatented algorithms to seperate libraries (OpenSSL).